permit a read timeout to be used in mod_cgid to give up on a slow CGI script.

In trunk, it defaults to the servers Timeout.  PR43494 

Submitted By: Eric Covener, Toshikuni Fukaya
Reviewed By: Eric Covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1535125 13f79535-47bb-0310-9956-ffa450edef68